Texas Instruments SN74AVCA406ZQCR

Overview

SN74AVCA406ZQCR from Texas Instruments is a voltage-translation transceiver for memory card interfaces, supporting MMC, SD, Memory Stick, SmartMedia, and xD-Picture Card standards. It features dual-supply operation (VCCA, VCCB0, VCCB1) across 1.4 V to 3.6 V, ±15-kV IEC 61000-4-2 air-gap ESD protection on B-port pins, and configurable MODE/CS pins for multi-card protocol selection. It enables low-voltage microprocessors to interface with higher-voltage memory cards in portable consumer devices.

For engineers reviewing the SN74AVCA406ZQCR datasheet, SN74AVCA406ZQCR pinout, SN74AVCA406ZQCR application, or SN74AVCA406ZQCR equivalent, key selection considerations include its triple-supply voltage translation architecture, memory-card-specific mode configuration (MODE0/MODE1), B-port ESD robustness, high-impedance A-port auto-disable when VCCB is off, and 48-ball VFBGA (ZQC) package compatibility with space-constrained mobile designs.

Technical Context

The SN74AVCA406ZQCR implements a bidirectional, direction-controlled voltage-level translator with separate A-port (microprocessor side) and B-port (memory card side) supply domains. VCCA powers all A-port I/Os and control inputs; VCCB0 powers 1B–4B, 9B1, 10B1; VCCB1 powers 5B–8B, 9B2, 10B2, 11B, 12B, 14B. The device supports 1-bit, 4-bit, and 8-bit memory card protocols via MODE0/MODE1 logic states.

Its operation includes automatic A-port high-impedance state when both VCCB0 and VCCB1 are at GND (e.g., no card inserted), and pin-specific output types: 12A is push-pull, 14B is open-drain (except in NAND flash/xD mode, where roles reverse). CS0 and CS1 enable dual-slot support with independent high-Z control per port group.

Key Specifications

Pinout & Package

SN74AVCA406ZQCR uses a 48-ball Very Thin Fine-Pitch Ball Grid Array (VFBGA) package designated ZQC (Pb-free), with 4 mm × 4 mm footprint and 0.5-mm ball pitch. Pin assignments follow TI's standardized top-view layout for GQC/ZQC packages.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-translation transceiver applications.

Compared with SN74AVCA406ZQCR, SN74AVCA16406GR offers identical functionality in a through-hole-compatible package but sacrifices board-area efficiency and thermal density, while SN74AVC4T245RTER provides only generic voltage translation without memory-card-specific control logic, ESD robustness, or multi-slot management capability.

Availability

SN74AVCA406ZQCR is available at Aetrix Electronics and suitable for mobile phones, digital cameras, and portable media players requiring stable component supply, high-reliability memory card interfacing, and long-term production continuity.

Supply support for SN74AVCA406ZQCR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in interface ICs and power management solutions.

SN74AVCA406ZQCR belongs to TI's AVCA-series voltage-translation transceivers, designed specifically for high-reliability, low-power memory card host interfaces in battery-operated portable electronics.

FAQ

What memory card standards does the SN74AVCA406ZQCR support?

The SN74AVCA406ZQCR supports MultiMediaCard (MMC), Secure Digital (SD/SDIO), Memory Stick™ compliant products, SmartMedia, and xD-Picture Card™ standards. Mode selection via MODE0 and MODE1 pins configures the device for specific protocols: SD/SDIO/MMC (MODE0=0), 8-bit MMC (MODE0=1, MODE1=0), or SmartMedia/xD (MODE0=1, MODE1=1). Each mode defines pin behavior, drive strength, and direction control to match the target standard's electrical and timing requirements.

How does the SN74AVCA406ZQCR handle power sequencing when a memory card is removed?

When both VCCB0 and VCCB1 are switched off (e.g., card removal), the SN74AVCA406ZQCR automatically places all A-port outputs into a high-impedance state. This prevents back-powering of the host processor and reduces static current draw. The feature is inherent to the device's internal power-detection circuitry and requires no external control or firmware intervention - it activates immediately upon loss of B-port supply voltage.

What is the purpose of the CS0 and CS1 pins on the SN74AVCA406ZQCR?

CS0 and CS1 are active-low card-select inputs that independently place A-port and B-port signal groups into high-impedance states. CS0 gates signals 1A–4A, 1B–4B, 9A, 9B1, and 10A2/10B1; CS1 gates 5A–8A, 5B–8B, 9B2, 10B2, 11B, 12B, and 14B. This enables dual-slot memory card support - for example, using CS0 for an SD slot and CS1 for a Memory Stick slot - without signal contention or additional isolation logic.

Does the SN74AVCA406ZQCR require external ESD protection diodes?

No, the SN74AVCA406ZQCR does not require external ESD protection diodes on the B-port (card-side) pins. It integrates ±15-kV IEC 61000-4-2 air-gap discharge and ±8-kV contact discharge protection on all B-port I/Os, exceeding typical memory card interface requirements. This integrated protection eliminates discrete TVS components, reduces bill-of-materials cost, and saves PCB area - confirmed by TI's SCES615H datasheet test reports.

What is the difference between the ZQC and GQC package variants of the SN74AVCA406?

The SN74AVCA406ZQCR (ZQC) is the Pb-free, RoHS-compliant version of the 48-ball VFBGA package, while SN74AVCA406GQCR (GQC) is the leaded variant. Both share identical pinout, electrical specifications, thermal characteristics, and mechanical dimensions (4 mm × 4 mm, 0.5-mm pitch). The ZQC variant meets modern environmental compliance requirements and is recommended for new designs targeting global markets with strict substance restrictions.